Sure but 3-4MB/s?! NDMP to tape is 40-50MB/s. Regular jobs to tape are
160MB/s. There is no excuse why the speed should be THIS slow. So I went
back and double checked a different job for the same host, which was an
OS backup. That job was also 6MB/s. So obviously it's something with the
client and not the data/directory being backed up. All of our other OS
backups are 10x-20x faster. This must be a host problem or a FBSD client
problem.
On 09/10/2010 02:54 PM, Bryan Bahnmiller wrote:
> Nate,
>
> Any filesystem you have will start out quickly but then drop in speed as
> it starts drilling down into the directory structure. The more directory
> levels you have, the slower it is. Which makes sense, since you are sort of
> following a tree structure down to the lower directory levels. Every time you
> drop down in a tree structure, you are branching to how ever many directories
> you have in that particular branch... And when you finish one branch, you pop
> back up a level and branch down to the next one. So you are following index
> links to index links to .... until you hit the actual file being backed up.
>
> Simple testing showed me long ago that the fewer levels you have in the
> directory tree, the quicker the backups. And depending on the filesystem, it
> can be orders of magnitude difference in speed.
>
> Bryan
>
>
>
> Nate Sanders <sandersn AT dmotorworks DOT com>
> Sent by: veritas-bu-bounces AT mailman.eng.auburn DOT edu
>
> 09/10/2010 02:02 PM
> To
> cc
> "veritas-bu AT mailman.eng.auburn DOT edu" <veritas-bu AT mailman.eng.auburn
> DOT edu>
> Subject
> Re: [Veritas-bu] NBU 6.5.6 client on FreeBSD 7.2 host
>
>
>
>
>
> Okay so that multiplex test was user error. Didn't have "max streams per
> drive" setup right. At 4 streams we saw 40MB/s, at 8 streams we see
> 50MB/s. But... we have a new problem. Within 1-2 minutes the I/O starts
> dropping. At 3:00 minutes into an 8 stream job, we're down to 38MB/s.
> Earlier when testing at 4 streams, we were 10 minutes in and I/O had
> slowly dropped from 40MB/s down to 12MB/s.
>
> What in the world is going on?
>
> On 09/10/2010 01:41 PM, Nate Sanders wrote:
>
>> Yes we are well aware of the limitations of NDMP and small files, thus
>> the reason we're looking at trying NFS w/ snapshots. Our NetApp 6040 is
>> peaking around 40-50MB/s but what the issue is right now is that we're
>> getting such low performance from this FBSD box via NFS.
>>
>> I turned on multiplexing to 4, and we're still seeing only 3-4MB/s.
>>
>>
>> On 09/10/2010 01:03 PM, Martin, Jonathan wrote:
>>
>>
>>> I've tested NDMP on 6 differetnt arrays and it has never moved millions
>>> of small files well. We maxed out backup performance on our NetApp FAS
>>> 2xxx with 2 streams at approx 20MB/sec total. We're hoping to test
>>> SMTape, which purportedly does a bit level dump of the entire array. I
>>> haven't had a chance to test this yet, but according to NetApp it will
>>> get us our weekly full and drive LTO3. We'll then need to put some sort
>>> of forever incremental or snapshot backup in-between the SMTape dumps.
>>>
>>> -Jonathan
>>>
>>> -----Original Message-----
>>> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
>>> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Nate
>>> Sanders
>>> Sent: Friday, September 10, 2010 12:22 PM
>>> To: veritas-bu AT mailman.eng.auburn DOT edu
>>> Subject: [Veritas-bu] NBU 6.5.6 client on FreeBSD 7.2 host
>>>
>>> Now that we made it to 6.5.6 we're able to start testing NFS performance
>>> from our NetApp VS NDMP. For the longest time we've done the backup of
>>> some 1 billion small image files off the NetApp via NDMP. This job
>>> usually took 1-3 weeks to complete a full sweep via NDMP.
>>>
>>> Since we have support for FBSD we thought we would try doing NFS via
>>> that client as Linux NFS is not as powerful as the BSD/Solaris variety.
>>> Well on our initial test of a small volume from the NetApp, we're seeing
>>> 2-4MB/s performance. Confirmed via bptm log. This is going straight to
>>> LTO4 tape, which usually backs up around 150MB/s. Logs show that the
>>> previous NDMP jobs from the NetApp we're doing around 40MB/s direct to
>>> two dedicated NDMP LTO4 drives.
>>>
>>> Supposedly multiplexing for NDMP will come to NBU 7.x shortly and we
>>> will test again with that in the future. Right now I am not multiplexing
>>> this NFS job but while looking in bptm I don't see the usual "waited for
>>> buffer" errors that would tell me that I _should_ increase it. Is it
>>> still likely multiplexing would increase the overall performance here?
>>> Is this a known issue with FBSD clients? Is there something else I
>>> should be looking at?
>>>
>>>
>>>
>>>
>>
> --
> Nate Sanders Digital Motorworks
> System Administrator (512) 692 - 1038
>
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